PIC12F508-I/MS - 8-bit 4MHz Flash MCU 768B | Microchip
MPN: PIC12F508-I/MS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.16 | $1.16 |
| 10 | $0.99 | $9.90 |
| 100 | $0.78 | $78.00 |
| 500 | $0.66 | $330.00 |
| 1,000 | $0.58 | $580.00 |
PIC12F508-I/MS Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit data-path CPU, program memory, working RAM, and peripherals on one die. The PIC12F508 belongs to Microchip's baseline PIC10/12 architecture family, sitting within the broader hierarchy of microcontrollers -> embedded processors -> semiconductors -> integrated circuits. Baseline PIC devices use a 12-bit wide instruction set that yields roughly 2:1 code compression versus competing 8-bit cores, enabling more application logic in fewer bytes of flash.
Key features include a hardware single-cycle multiplier-free ALU, internal 4 MHz RC oscillator calibrated to +/- 1 percent typical accuracy, watchdog timer with on-chip low-power RC oscillator, power-on reset, brown-out reset, and an in-circuit serial programming (ICSP) interface. The device sources/sinks up to 25 mA per I/O pin and supports industrial -40C to +85C operating temperatures.
Architecturally the PIC12F508 uses a RISC-style Harvard design with separate program and data buses, a single accumulator (W register) plus a 32-byte register file, and a 2-stage pipeline. The flash memory supports in-circuit serial programming, allowing firmware to be updated on assembled boards without removing the device. A 4 MHz internal oscillator eliminates the external crystal typically required, reducing BOM cost and PCB area.
Typical applications include LED lighting controllers, battery chargers, simple sensor signal conditioning, low-cost consumer appliances, and pin-compatible upgrades to legacy PIC12C508A designs. The compact MSOP-8 footprint makes it ideal for space-constrained designs.
When designing with this MCU, allocate adequate decoupling (100 nF + 10 uF bulk) near the VDD pin. The ICSP pins (GP1/GP0) must be accessible for in-circuit programming; consider adding test points or a 2x3 header to the PCB.
This page synthesizes verified distributor pricing, pin-compatible drop-in alternatives from Microchip and competitor equivalents, and practical design notes not found in a single source.
Drop-in alternatives for PIC12F508-I/MS — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC12F508-I/MS (same form factor and footprint) — differing in Package, Timers, Watchdog Timer, Internal Oscillator, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC12F509-I/MS
✅ Drop-In✓ In Stock
$0.51 / Unit
View Datasheet →PIC12F508-E/MS
✅ Drop-In✓ In Stock
$0.5479 / Unit
View Datasheet →PIC12F508-I/SN
✅ Drop-In✓ In Stock
$0.31 / Unit
View Datasheet →PIC12F509-I/SN
✅ Drop-In✓ In Stock
$0.71 / Unit
View Datasheet →PIC12F508T-I/MS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC12F508-I/MC
✅ Drop-In✓ In Stock
$0.47 / Unit
View Datasheet →PIC12F508-I/MS Maximum Ratings & Electrical Characteristics
| Product Family | PIC12 baseline |
| Core | 8-bit RISC Harvard |
| Instruction Set | 12-bit wide, 33 instructions |
| Program Memory (Flash) | 768 B (512 x 12 words) |
| RAM | 25 B |
| Maximum CPU Speed | 4 MHz |
| Performance | 4 MIPS @ 4 MHz |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 6 (GP0-GP5) |
| Timers | 1 x 8-bit (TMR0 with watchdog) |
| Watchdog Timer | Yes (independent RC oscillator) |
| Brown-Out Reset | Yes |
| Power-On Reset | Yes |
| In-Circuit Serial Programming (ICSP) | Yes |
| Internal Oscillator | 4 MHz RC (+/- 1 percent typical) |
| I/O Pin Current (source/sink) | 25 mA / 25 mA |
| Operating Temperature | -40 C to +85 C (industrial) |
| Package | MSOP-8 (3 x 3 mm) |
| Mounting Type | Surface Mount |
| Lead-Free / RoHS | Yes (lead-free finish) |
PIC12F508-I/MS Pin Configuration
| Pin 1 | GP5/OSC1/CLKIN — General-purpose I/O / external oscillator input |
| Pin 2 | GP4/OSC2/CLKOUT — General-purpose I/O / oscillator output |
| Pin 3 | GP3/MCLR/VPP — General-purpose input only / Master Clear reset / programming voltage |
| Pin 4 | GP2/T0CKI/INT/COUT — General-purpose I/O / Timer0 clock input / external interrupt / comparator output |
| Pin 5 | GP1/ICSPCLK — General-purpose I/O / ICSP serial clock |
| Pin 6 | GP0/ICSPDAT — General-purpose I/O / ICSP serial data |
| Pin 7 | VSS — Ground reference |
| Pin 8 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
Typical Applications
PIC12F508-I/MS is suitable for 6 applications: LED Lighting Controller, Battery Charger / Monitor, Simple Sensor Signal Conditioning, Low-Cost Consumer Appliance Controller, Legacy PIC12C508A Replacement, Hobby / Maker Educational Projects.
LED Lighting Controller
The PIC12F508-I/MS is well suited to LED lighting controllers and decorative light drivers where cost and PCB area dominate the design. Its 6 bidirectional I/O pins can each source/sink 25 mA per the Microchip datasheet 41236E, which is enough to drive small indicator LEDs or low-current LED strips via transistors. The 4 MHz internal oscillator eliminates external crystals, and the 768-byte flash holds typical PWM-pattern or chase-effect firmware comfortably. The wide 2.0-5.5V supply range supports both 3.3V and 5V LED designs, while brown-out reset prevents flicker during brown-outs. The compact MSOP-8 footprint fits inside bulb-base PCBs where every square millimeter matters.
Recommended
Battery Charger / Monitor
The PIC12F508-I/MS fits low-cost single-cell and multi-cell battery chargers and simple fuel-gauge monitors. The 2.0-5.5V operating range covers 1S lithium packs down to depletion and 4-cell NiMH packs up to full charge. Per Microchip datasheet 41236E, the 25 mA I/O sourcing capability is sufficient to drive indicator LEDs and small MOSFET gate signals for protection circuits. The internal 4 MHz RC oscillator and on-chip watchdog reduce BOM cost - no external crystal or supervisor IC required. The 768-byte flash fits typical CC-CV charge profiles and timeout-based termination logic.
Recommended
Simple Sensor Signal Conditioning
The PIC12F508-I/MS is a good fit for simple sensor signal-conditioning tasks like thermistor linearization, switch debouncing, or threshold detectors. Per datasheet 41236E, the 8-bit ADC-free architecture is best for digital sensors or comparator-style analog tasks; designers can implement software timing loops using TMR0 for periodic sampling. The 6 I/O pins provide enough headroom for sensor input, control output, status LED, and ICSP programming without multiplexing. Industrial -40C to +85C temperature range supports outdoor sensor housings and factory-floor environments.
Recommended
Low-Cost Consumer Appliance Controller
The PIC12F508-I/MS is widely deployed in low-cost consumer appliances such as fans, toasters, coffee makers, and personal care devices. Per Microchip datasheet 41236E, the combination of 6 I/O, watchdog timer, brown-out reset, and 25 mA I/O drive directly addresses the BOM-conscious appliance market. The internal RC oscillator and 2.0-5.5V range handle 3.3V battery-powered or 5V mains-derived supplies equally well. The 768-byte flash accommodates typical state-machine firmware with mode buttons, timers, and indicator LEDs.
Recommended
Legacy PIC12C508A Replacement
The PIC12F508-I/MS is the flash-based replacement for the older EPROM-based PIC12C508A in the same MSOP-8 package and pinout, providing a drop-in upgrade path. Per Microchip datasheet 41236E, the PIC12F508 adds in-circuit serial programming and offers the same 768-byte program memory. Designers retiring the obsolete PIC12C508A in favor of an active-life-cycle part can usually swap directly with no PCB change. Per the FindMyChip alternatives data, the /MS variant is one of the most commonly requested PIC12C508A equivalents.
Recommended
Hobby / Maker Educational Projects
The PIC12F508-I/MS is a popular entry point for hobbyists, students, and makers learning 8-bit embedded development. The MSOP-8 footprint is breadboard-friendly with a breakout adapter, and the wide 2.0-5.5V range lets learners power the chip from a single Li-ion cell or USB 5V. Per Microchip datasheet 41236E, the in-circuit serial programming interface lets students reprogram the device in-place without removing it from the breadboard. The PICkit programmer and MPLAB X IDE are free, and the 768-byte flash is enough to host classic blink-LED, button-debounce, and tone-generation exercises.
Recommended
Recommended Products Summary
Engineering reference data for PIC12F508-I/MS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC12F509-I/MS | PIC12F508-E/MS | PIC12F508-I/SN | PIC12F509-I/SN | PIC12F508T-I/MS | PIC12F508-I/MC |
|---|---|---|---|---|---|---|---|
| Package | MSOP-8 | MSOP-8 | MSOP-8 | SOIC-8 | SOIC-8 | MSOP-8 | DFN-8 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 768 B | 1.5 KB | 768 B | 768 B | 1.5 KB | 768 B | 768 B |
| RAM | 25 B | 41 B | 25 B | 25 B | 41 B | 25 B | 25 B |
| Maximum CPU Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| I/O Pins | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Internal RC Oscillator | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| ICSP Support | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Lowest-cost Microchip baseline MCU in active production (vs PIC12F1822-I/MS)
- MSOP-8 surface-mount package option (vs PIC12F508-I/P (DIP-8))
- Drop-in compatibility with PIC12F509 family (vs PIC12F508 vs PIC12C508A)
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 8), plus a 10 uF bulk capacitor on the same supply trace. The PIC12F508 datasheet (41236E) recommends minimizing VDD trace inductance to prevent logic errors during high-current I/O switching events. If using GP3 as MCLR, route the MCLR pull-up resistor network close to pin 3 to ensure clean reset behavior.
Reserve the ICSP signals GP1/ICSPCLK (pin 5) and GP0/ICSPDAT (pin 6) for programming - do not load them with heavy external circuitry that would prevent the PICkit from driving them during programming. A 2x3 0.1-inch header footprint or simple test pads is the recommended approach. Per Microchip development guidelines, adding a small resistor in series with the ICSP lines (under 1 kohm) can protect the programmer from production-board shorts.
Configuration word bits must be set correctly or the MCU may fail to start. The PIC12F508 datasheet (41236E) flags the WDT (watchdog timer) and code-protection bits as commonly missed - leaving WDT enabled in a tight loop without servicing will trigger a reset. Brown-out voltage threshold (BOD) should be selected to match your supply rail; an incorrect threshold causes either spurious resets (too high) or undefined execution at low voltage (too low).
The MSOP-8 thermal pad (if present) is electrically floating and should be soldered to a small copper pour for mechanical reliability, but it is NOT a ground connection on this part. Per the Microchip MSOP-8 package drawing, the center pad on some MSOP-8 derivatives is a no-connect - verify against the specific package outline before tying it to ground.
Compliance Information
RoHS compliant and lead-free per Microchip product page and DigiKey listing (2026-09-15). Not AEC-Q100 qualified - automotive applications should use PIC16F or PIC18 families. Halogen-free status not stated in available data.
